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Physics of Electronic and Atomic Collisions: ICPEAC VII

Spin Dependence of the Total Cross-Section of Rubidium Atoms Colliding with Thermal Energies

P. Geittner, M. Elbel

Published Jan 1, 1971• 0 citations
OpenAlex

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Excitation of rubidium ions at the thermal collisions with metastable helium atoms

A. A. Gudkov, Viktor F. Kravchenko, V. F. Papakin

•Jan 1, 1973•0 citations
We calculate the total and differential cross sections for radiative-collisional excitation of the metastable 2 1 S state of He atoms at collisions with Ne atoms in external radiation fields of various frequencies and polarizations. The calculations are performed for a thermal collision energy of E = 10 −3 atomic units and light intensity of I = 1 MW cm −2 , which corresponds to a single photon absorption by a quasi-molecule during the collision. Both the differential and total cross sections are shown to depend strongly on the relative orientation of the radiation polarization vector and the initial relative velocity vector of the colliding atoms. We analyze the azimuthal scattering asymmetry related to the orientation of the angular momentum of the absorbed photon.
Alignment and orientation effects in the energy pooling process, Sr(5s5p 3 P 1 ) + Sr(5s5p 3 P 1 ) → Sr(5s5p 1 P 1 ) + Sr(5s 2 1 S 0 ), are studied in a single atomic beam. The Sr atoms are prepared in an aligned initial state with a polarized laser, and alignment information is extracted by observing the fluorescence from the final Sr(5s5p 1 P 1 ) state as the atoms precess in an applied magnetic field. This allows the dependence of the total energy pooling cross section (integrated over the final state alignment) on the initial state alignment to be almost completely described. A prominent alignment effect is observed. If m j represents the component of total electronic angular momentum of a Sr(5s5p 3 P 1 ) atom along the relative velocity vector of the collision, then the total energy transfer cross section for a particular initial state alignment can be expressed as a sum of the so-called fundamental cross sections, σ m 1 m 2 and σ m 1 m 2; m 1 ‘ m 2 ‘, that describe collisions between the various m j states. Here σ m 1 m 2 represents the cross section for energy transfer when an atom in state m 1 collides with an atom in state m 2 . The cross section σ m 1 m 2; m 1 ‘ m 2 ‘ represents the contribution to the total cross section from interference when the colliding system is in a superposition of the state m 1 colliding with m 2 and the state m 1 ‘ colliding with m 2 ‘. It is found that the cross sections σ 1-1, σ 00, and σ 10 as well as the interference terms Re( σ 00;1-1 ) and σ 01;10 have relatively large values while σ 11 and σ 1-1;-11 are small. Coupled with future theoretical work, these results may provide new insights into the dynamics of the curve crossings that lead to energy transfer.